02 fx140 cylinder bore material

anyone know what the cylinder material of the fx140 motor is? magnet sticks to it so asuming its steel. Wondering if i can bore it out and have it nickasil plated after being bored oversize. or if i should just buy the sleeves from la sleeve and sleeve it with ductile iron sleeves.

need to repair mine as i bought a motor that water sat in the cylinders for over a year, ate the tops of the cylinders, pistons, and head. the cases are worth putting the money into and just replacing the head. Will be doing simple mods to get a little extra hp out of it. mostly aftermarket r1 sportbike engine parts. and a stand alone ecu from aem. if i can get 20 hp out of some head cleanup, valvetrain, stand alone ecu with tuning, and a bump in compression id be happy.